Tests/Docs: changing type of msg.sender and tx.origin into address

And also making the type of address(literal) as non-payable address.

docs/examples/blind-auction.rst

@@ -114,7 +114,7 @@ to receive their money - contracts cannot activate themselves.
                 // before `send` returns.
                 pendingReturns[msg.sender] = 0;
 
-                if (!msg.sender.send(amount)) {
+                if (!payable(msg.sender).send(amount)) {
                     // No need to call throw here, just reset the amount owing
                     pendingReturns[msg.sender] = amount;
                     return false;
@@ -280,7 +280,7 @@ invalid bids.
                 // the same deposit.
                 bidToCheck.blindedBid = bytes32(0);
             }
-            msg.sender.transfer(refund);
+            payable(msg.sender).transfer(refund);
         }
 
         /// Withdraw a bid that was overbid.
@@ -293,7 +293,7 @@ invalid bids.
                 // conditions -> effects -> interaction).
                 pendingReturns[msg.sender] = 0;
 
-                msg.sender.transfer(amount);
+                payable(msg.sender).transfer(amount);
             }
         }
 

docs/examples/micropayment.rst

@@ -159,13 +159,13 @@ The full contract
 
             require(recoverSigner(message, signature) == owner);
 
-            msg.sender.transfer(amount);
+            payable(msg.sender).transfer(amount);
         }
 
         /// destroy the contract and reclaim the leftover funds.
         function shutdown() public {
             require(msg.sender == owner);
-            selfdestruct(msg.sender);
+            selfdestruct(payable(msg.sender));
         }
 
         /// signature methods.
@@ -347,7 +347,7 @@ The full contract
         constructor (address payable _recipient, uint256 duration)
             payable
         {
-            sender = msg.sender;
+            sender = payable(msg.sender);
             recipient = _recipient;
             expiration = block.timestamp + duration;
         }

docs/examples/safe-remote.rst

@@ -74,7 +74,7 @@ you can use state machine-like constructs inside a contract.
         // Division will truncate if it is an odd number.
         // Check via multiplication that it wasn't an odd number.
         constructor() payable {
-            seller = msg.sender;
+            seller = payable(msg.sender);
             value = msg.value / 2;
             require((2 * value) == msg.value, "Value has to be even.");
         }
@@ -107,7 +107,7 @@ you can use state machine-like constructs inside a contract.
             payable
         {
             emit PurchaseConfirmed();
-            buyer = msg.sender;
+            buyer = payable(msg.sender);
             state = State.Locked;
         }